问题 解答题
下面各题,你认为怎样算简便就怎样算.
1.25×32×2.5
3
4
+
1
4
×
4
7
7.38-(1.57+2.38)
9
10
+
9
10
×99
       
1
6
÷
[1÷(
3
5
-
3
10
)]
4.8×96+4.8÷
1
4
答案

(1)1.25×32×2.5

=1.25×(8×4)×2.5

=(1.25×8)×(4×2.5)

=10×10

=100

(2)

3
4
+
1
4
×
4
7

=

3
4
+
1
7

=

25
28

(3)7.38-(1.57+2.38)

=7.38-1.57-2.38

=7.38-2.38-1.57

=5-1.57

=3.43

(4)

9
10
+
9
10
×99

=

9
10
×(1+99)

=0.9×100

=90

(5)

1
6
÷[1÷(
3
5
-
3
10
)]

=

1
6
÷[1÷
3
10
]

=

1
6
÷
10
3

=0.05

(6)4.8×96+4.8÷

1
4

=4.8×96+4.8×4

=4.8×(96+4)

=4.8×100

=480

单项选择题
单项选择题